<template>
  <div class="swiper-container" ref="Swiper">
    <div class="swiper-wrapper">
      <div
        class="swiper-slide"
        v-for="(item, index) in skuImageList"
        :key="item.id"
      >
        <img
          :src="item.imgUrl"
          @click="activeImg(index)"
          :class="{ active: index === defaultIndex }"
        />
      </div>
    </div>
    <div class="swiper-button-next"></div>
    <div class="swiper-button-prev"></div>
  </div>
</template>

<script>
import Swiper from 'swiper'
export default {
  name: 'ImageList',
  props: ['skuImageList'],
  data() {
    return {
      defaultIndex: 0
    }
  },
  methods: {
    // 点击切换缩略图的样式 和 点击大图的回调 用事件总线传递索引
    activeImg(index) {
      this.defaultIndex = index
      // 用事件总线向Zoom组件传值
      this.$bus.$emit('getZoomIndex', index)
    }
  },
  watch: {
    skuImageList: {
      immediate: true,
      handler() {
        this.$nextTick(() => {
          new Swiper(this.$refs.Swiper, {
            // loop: true, // 循环模式选项 要关闭 会和点击事件冲突
            // 如果需要分页器
            pagination: {
              el: '.swiper-pagination'
            },
            // 如果需要前进后退按钮
            navigation: {
              nextEl: '.swiper-button-next',
              prevEl: '.swiper-button-prev'
            },
            //控制当前视口中依次展示几个slide
            slidesPerView: 4,
            //每次切换走几个slide
            slidesPerGroup: 4
          })
        })
      }
    }
  }
}
</script>

<style lang="less" scoped>
.swiper-container {
  height: 56px;
  width: 412px;
  box-sizing: border-box;
  padding: 0 12px;

  .swiper-slide {
    width: 56px;
    height: 56px;

    img {
      width: 100%;
      height: 100%;
      border: 1px solid #ccc;
      padding: 2px;
      width: 50px;
      height: 50px;
      display: block;

      &.active {
        border: 2px solid #f60;
        padding: 1px;
      }

      &:hover {
        border: 2px solid #f60;
        padding: 1px;
      }
    }
  }

  .swiper-button-next {
    left: auto;
    right: 0;
  }

  .swiper-button-prev {
    left: 0;
    right: auto;
  }

  .swiper-button-next,
  .swiper-button-prev {
    box-sizing: border-box;
    width: 12px;
    height: 56px;
    background: rgb(235, 235, 235);
    border: 1px solid rgb(204, 204, 204);
    top: 0;
    margin-top: 0;
    &::after {
      font-size: 12px;
    }
  }
}
</style>